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An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. that there is a natural tendency of objects to keep on doing what they're doing. This is why you wear a seatbelt! Newton’s 2nd Law: Law of Acceleration (Force) Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). F = ma Newton (N) = kg • m/s2 that the heavier the object is, the more force it requires to move it the same distance as a lighter object. Vs. Which is easier? For every action there is an equal and opposite re-action. that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard. The rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.